Nmap 4.69beta1 assertion failure

[LevelZero <levelzero () retry org>]

I was poking around on nmap 4.69beta1 today on my XPSP3 box and while doing
a basic TCP connect scan, I keep getting assertion failures. I tested both
on one of my own boxes and on scanme.nmap.org

Below a sample output:

nmap -v -v -v -v -d -d -sT scanme.nmap.org
<parts cut that run normally>
Initiating Connect Scan at 23:53
Scanning scanme.nmap.org (64.13.134.52) [1000 ports]
Discovered open port 53/tcp on 64.13.134.52
Discovered open port 80/tcp on 64.13.134.52
Assertion failed: USI->scantype != CONNECT_SCAN, file ..\scan_engine.cc,
line 2843

This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.

At first I thought it might be related to the winpcap version I already had
installed, so I uninstalled nmap and winpcap after which I ran the
installer again, but this didn't change a thing.

Any ideas what can cause this?

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